perf(semantic): optimize scope resolution with fast paths and inlining by Boshen · Pull Request #19029 · oxc-project/oxc

Boshen · 2026-02-06T06:32:04Z

Summary

Add early return when current scope has no unresolved references
Skip resolution entirely for scopes with no bindings (if-blocks, try-blocks, loop bodies without let) — merge unresolved refs to parent using O(1) swap when possible
Use union-by-size merge (drain smaller map into larger) for non-empty parents
Add #[inline] to hot per-reference functions: declare_reference, reference_identifier, create_reference

Benchmark results (semantic)

group                                  main                                   pr
-----                                  ----                                   --
semantic/RadixUIAdoptionSection.jsx    1.05      4.1±0.05µs        ? ?/sec    1.00      3.9±0.03µs        ? ?/sec
semantic/binder.ts                     1.03   469.3±26.69µs        ? ?/sec    1.00   456.3±17.59µs        ? ?/sec
semantic/cal.com.tsx                   1.00      3.6±0.03ms        ? ?/sec    1.01      3.6±0.04ms        ? ?/sec
semantic/react.development.js          1.01    171.9±3.86µs        ? ?/sec    1.00    170.0±9.19µs        ? ?/sec

Benchmark results (pipeline)

group                                  main                                   pr
-----                                  ----                                   --
pipeline/RadixUIAdoptionSection.jsx    1.03     29.8±0.35µs        ? ?/sec    1.00     29.0±0.25µs        ? ?/sec
pipeline/binder.ts                     1.00      2.9±0.07ms        ? ?/sec    1.00      2.9±0.09ms        ? ?/sec
pipeline/cal.com.tsx                   1.00     25.0±0.32ms        ? ?/sec    1.01     25.2±0.36ms        ? ?/sec
pipeline/react.development.js          1.03  1317.1±96.08µs        ? ?/sec    1.00  1273.5±18.26µs        ? ?/sec

Analysis

Scope resolution (resolve_references_for_current_scope) is called on every scope exit. Many scopes (if-blocks, try-blocks, loop bodies) have zero bindings, yet the current code still drains all unresolved references one-by-one through hash maps. The swap optimization makes this O(1) for the common case where the parent has no accumulated refs yet (first/only child scope).

The #[inline] additions target functions called per-identifier-reference (~hundreds to thousands of times per file) that were not previously inlined.

Note: 3 linter snapshot ordering changes expected (diagnostics emitted in different order due to hash map iteration order change from swap).

🤖 Generated with Claude Code

codspeed-hq · 2026-02-06T06:37:37Z

Merging this PR will improve performance by 4.19%

⚡ 1 improved benchmark
✅ 46 untouched benchmarks
⏩ 3 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	Simulation	`semantic[react.development.js]`	1.3 ms	1.2 ms	+4.19%

_{Comparing perf/scope-resolution-fast-path (87aee07) with main (8536dce)}

3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

Copilot

Pull request overview

This PR optimizes scope resolution in semantic analysis by adding fast paths and early returns to reduce unnecessary work. The optimization targets the common case where scopes have no bindings (if-blocks, try-blocks, loop bodies without let), allowing unresolved references to bubble up to parent scopes without per-reference hash map lookups. Additionally, #[inline] attributes are added to hot-path functions called hundreds to thousands of times per file.

Changes:

Early return when current scope has no unresolved references
Fast path for scopes with no bindings using O(1) swap when parent is empty, or union-by-size merge otherwise
Add #[inline] to per-reference hot path functions: declare_reference, reference_identifier, create_reference

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
`crates/oxc_semantic/src/builder.rs`	Add early return and fast path optimizations to `resolve_references_for_current_scope`, add `#[inline]` to `declare_reference` and `reference_identifier`
`crates/oxc_semantic/src/scoping.rs`	Add `#[inline]` to `create_reference`
`tasks/track_memory_allocations/allocs_semantic.snap`	Updated memory allocation tracking showing reduced system allocations
`tasks/track_memory_allocations/allocs_minifier.snap`	Updated memory allocation tracking showing reduced system allocations
`tasks/coverage/snapshots/semantic_typescript.snap`	Reference ID ordering changes due to hash map iteration order (benign)
`crates/oxc_linter/src/snapshots/jest_valid_describe_callback.snap`	Diagnostic ordering changes due to hash map iteration order (benign)
`crates/oxc_linter/src/snapshots/[email protected]`	Diagnostic ordering changes due to hash map iteration order (benign)
`crates/oxc_linter/src/snapshots/jest_no_confusing_set_timeout.snap`	Diagnostic ordering changes due to hash map iteration order (benign)

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Boshen · 2026-02-06T12:08:41Z

Merge activity

Feb 6, 12:08 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
Feb 6, 12:08 PM UTC: Boshen added this pull request to the Graphite merge queue.
Feb 6, 12:15 PM UTC: Merged by the Graphite merge queue.

#19029) ## Summary - Add early return when current scope has no unresolved references - Skip resolution entirely for scopes with no bindings (if-blocks, try-blocks, loop bodies without `let`) — merge unresolved refs to parent using O(1) swap when possible - Use union-by-size merge (drain smaller map into larger) for non-empty parents - Add `#[inline]` to hot per-reference functions: `declare_reference`, `reference_identifier`, `create_reference` ### Benchmark results (semantic) ``` group main pr ----- ---- -- semantic/RadixUIAdoptionSection.jsx 1.05 4.1±0.05µs ? ?/sec 1.00 3.9±0.03µs ? ?/sec semantic/binder.ts 1.03 469.3±26.69µs ? ?/sec 1.00 456.3±17.59µs ? ?/sec semantic/cal.com.tsx 1.00 3.6±0.03ms ? ?/sec 1.01 3.6±0.04ms ? ?/sec semantic/react.development.js 1.01 171.9±3.86µs ? ?/sec 1.00 170.0±9.19µs ? ?/sec ``` ### Benchmark results (pipeline) ``` group main pr ----- ---- -- pipeline/RadixUIAdoptionSection.jsx 1.03 29.8±0.35µs ? ?/sec 1.00 29.0±0.25µs ? ?/sec pipeline/binder.ts 1.00 2.9±0.07ms ? ?/sec 1.00 2.9±0.09ms ? ?/sec pipeline/cal.com.tsx 1.00 25.0±0.32ms ? ?/sec 1.01 25.2±0.36ms ? ?/sec pipeline/react.development.js 1.03 1317.1±96.08µs ? ?/sec 1.00 1273.5±18.26µs ? ?/sec ``` ### Analysis Scope resolution (`resolve_references_for_current_scope`) is called on every scope exit. Many scopes (if-blocks, try-blocks, loop bodies) have zero bindings, yet the current code still drains all unresolved references one-by-one through hash maps. The swap optimization makes this O(1) for the common case where the parent has no accumulated refs yet (first/only child scope). The `#[inline]` additions target functions called per-identifier-reference (~hundreds to thousands of times per file) that were not previously inlined. Note: 3 linter snapshot ordering changes expected (diagnostics emitted in different order due to hash map iteration order change from swap). 🤖 Generated with [Claude Code](https://claude.com/claude-code)

### 💥 BREAKING CHANGES - 2bf7293 mangler: [**BREAKING**] Enable `top_level` by default for modules and commonjs (#18278) (sapphi-red) - 48b0542 span: [**BREAKING**] SourceType::ts should set module to unambigious (#18873) (Boshen) ### 🚀 Features - 500d071 minifier: Local traverse ctx and generated minifier traverse (#19106) (Boshen) - 142a1be parser: Detect binary files with TS1490 error (#19047) (Boshen) - e316857 allocator/bitset: Add `Ones` iterator to `BitSet` (#19027) (sapphi-red) - 742ad3f minifier: Default `invalid_import_side_effects` to `false` (#18916) (sapphi-red) - 0eff6be parser: Error JSX-like type assertions and generics in `.mts`/`.cts` (#18910) (Boshen) - 18320c6 span: Store file extension in `SourceType` (#18893) (Boshen) ### 🐛 Bug Fixes - a7514e4 isolated-declarations: Preserve const context in literal type inference (#19178) (camc314) - 312e756 isolated-declarations: Preserve readonly literal initializers (#19177) (camc314) - d0ca8d0 isolated-declarations: Skip parenthesis when inferring type (#19176) (camc314) - 110c300 oxc_ecmascript: `+[false]` and `+[true]` should evaluate to `NaN` (#19174) (copilot-swe-agent) - f32ea19 semantic: Report redeclaration error for import bindings conflicting with value declarations (#19068) (Boshen) - 3aeba7a semantic: Report redeclaration error for `function a() {} var a` in module mode (#19041) (Boshen) - 35e32c6 coverage: Match Babel's options.json inheritance for test fixtures (#19002) (Boshen) - 463d60d semantic: Skip TS2391 for standalone computed-name class methods (#19025) (Boshen) - 56c086b parser: Add modifier ordering validation (TS1029) (#19024) (Boshen) - 6067a49 linter/jsdoc: False positive in `check-tag-names` for `@` in email addresses and npm scopes (#19021) (Boshen) - b13bb70 semantic/jsdoc: Inline tags like `{@link}` break jsdoc parsing (#19019) (Boshen) - e3609e3 regular_expression: Preserve UnicodeEscape CharacterKind in string literals (#18998) (Boshen) - 57917ee parser: Parse decorators on rest parameters (#18938) (Boshen) - 487601b napi: Disable mimalloc on Windows to fix worker_threads crash (#18923) (Boshen) - 1f6b193 parser: Validate TypeScript import type options (#18889) (Boshen) - 1663184 parser: Allow conditional types in function type parameters (#18886) (Boshen) - 5758046 parser: Error on property access after instantiation expression (#18887) (Boshen) - 5eb4a94 parser: Handle `<<` as two `<` tokens in type argument contexts (#18885) (Boshen) ### ⚡ Performance - ed8c054 oxc_str: Add precomputed hash to Ident for fast HashMap lookups (#19143) (Boshen) - d4a0867 transformer_plugins: Switch ReplaceGlobalDefines from Traverse to VisitMut (#19146) (Boshen) - 9eb16b3 syntax: Pack ASCII identifier tables into single bitflag table (#19088) (Boshen) - e7595d1 mangler: Use BitSet for exported symbols set (#19023) (sapphi-red) - 2537924 semantic: Optimize scope resolution with fast paths and inlining (#19029) (Boshen) - 69a8d85 mangler: Use BitSet for keep_names symbols set (#19028) (sapphi-red) - f78c525 parser: Try hybrid parsing for jsx children and closing element/fragments (#18789) (camchenry) Co-authored-by: camc314 <[email protected]>

# Oxlint ### 🚀 Features - aef2af5 linter/unicorn: Add fixer for `unicorn/relative-url-style` rule (#19186) (Mikhail Baev) - 80eba6f linter/max-params: Support `countThis` option (#19175) (camc314) - e19bc45 linter/no-new-func: Improve rule diagnostic with note and actionable help message (#19132) (Sean Gallen) - e3dc5f6 linter/plugins: `RuleTester` test suggestions (#19104) (overlookmotel) - 6054249 linter/plugins: Add `recursive` option to `RuleTester` (#19093) (overlookmotel) - 27c241b linter/plugins: `RuleTester` test fixes (#19091) (overlookmotel) - 7318275 linter/new-cap: Tighten diagnostic spans and add help text (#19131) (camchenry) - ac2b16b linter: Improve `no-misleading-character-class` diagnostic spans (#19109) (Sysix) - 7be8613 linter: Move `no-misleading-chracter-class` to `correctness` (#19006) (Sysix) - 87a920d ci: Add riscv64 and s390x napi targets for oxlint and oxfmt (#19039) (Boshen) - ee2925b oxlint/lsp: Enable JS plugins (#18834) (overlookmotel) - 533013d linter/unicorn: Implement suggestion for `unicorn/prefer-dom-node-dataset` (#19051) (Mikhail Baev) - 384abae linter/oxc/no-async-endpoint-handlers: Improve diagnostic message (#19001) (camc314) - d35ece3 linter/array-callback-return: Improve diagnostic hints for some cases (#18993) (camc314) - dd0f754 linter/array-callback-return: Improve diagnostic message for `forEach` case (#18992) (camc314) - e2d28fe linter/plugins: Implement suggestions (#18963) (overlookmotel) - a398152 linter: Promote the `eslint/no-iterator` rule to correctness, which makes it a default rule (#18915) (connorshea) - bb1eb97 linter: Improve diagnostic message for circular configs (#18947) (camc314) - 3184f36 linter: Ban relative js plugin specifiers in js extends config (#18944) (camc314) - 749972f linter: Validate dynamic config extends shape (#18943) (camc314) - b270739 linter: Support extends in oxlint.config.ts (#18942) (camc314) - 6024ddf linter: Implement suggestion for `unicorn/prefer-reflect-apply` (#18932) (Mikhail Baev) - b06b3a9 linter: Implement `typescript/consistent-type-assertions` (#18869) (Bazyli Brzóska) - 9fd3bd6 linter/plugins: Add `@oxlint/plugins` NPM package (#18824) (overlookmotel) - 5ee7b2f linter/vitest: Implements `prefer-expect-type-of` rule (#17957) (Said Atrahouch) - a7b360a linter/unicorn: Implement `unicorn/relative-url-style` rule (#18857) (Mikhail Baev) - 9788a96 oxlint,oxfmt: Add more native builds (#18853) (Boshen) - b23395a linter: Enforce exporting an object with `defineConfig` (#18858) (camc314) ### 🐛 Bug Fixes - 7800fc5 linter/prefer-event-target: Ignore EventEmitter imported from packages (#19188) (camc314) - 03b2955 linter/typescript/ban-types: Mark rule as deprecated (#19179) (camc314) - a5b8766 oxlint/lsp: Disable rule for this line should not be preferred (#19083) (Sysix) - e08157e linter/jsx-filename-extension: Include filename in as-needed diagnostic (#19172) (camc314) - 1773acb oxlint: Re-generate envs (#19169) (camc314) - 51c3fc8 linter/no-array-for-each: Skip `Effect.forEach` calls (#19127) (camc314) - 825f148 linter/plugins: `RuleTester` consider adjacent fixes as overlapping in ESLint compat mode (#19094) (overlookmotel) - ecd2456 linter/plugins: Handle fix with -1 offsets in file with BOM (#19092) (overlookmotel) - 5969d26 linter/no-array-sort: Avoid false positives for effect Chunk.sort (#19125) (camc314) - de10f04 linter: `no-misleading-character-class`: do not skip reporting on first invalid sequence of the checking group (#19111) (Sysix) - 8c0ce78 linter: Scope no-misleading-character-class sequences to single character class (#19108) (copilot-swe-agent) - 879e3a0 linter: `no-misleading-character-class`: split sequences on all `CharacterSet` (#19107) (Sysix) - 2ad33cc oxlint/lsp: Search parent directories for root oxlint config (#19062) (copilot-swe-agent) - f969d5e linter/prefer-dom-node-dataset: Address some edge cases in the fixer (#19065) (camc314) - ed759d1 linter/plugins: Fix error messages for invalid suggestions (#19059) (overlookmotel) - 34851a7 linter/plugins: Error not panic if invalid fix range (#19058) (overlookmotel) - 4823b58 linter/plugins: Fix fixes in files with BOM (#19056) (overlookmotel) - 2ef405e linter/no-map-spread: Improve actionability of error message (#19007) (Artyom Alekseevich) - 56c086b parser: Add modifier ordering validation (TS1029) (#19024) (Boshen) - 6067a49 linter/jsdoc: False positive in `check-tag-names` for `@` in email addresses and npm scopes (#19021) (Boshen) - 6d46ed9 linter/capitalized-comments: Ignore prettier and oxfmt directives (#19008) (Artyom Alekseevich) - a46c878 linter/react/no-array-index-key: Look for keys in expressions (#18997) (camc314) - 7d61704 linter/prefer-at: Skip autofix for `arguments` (#18991) (camc314) - 3ebae53 linter/preserve-caught-error: Skip traversing into nested try/catch stmts (#18990) (camc314) - e94d37e linter/react/no-unknown-property: Add missing `popover` related props (#18953) (Christoph Nakazawa) - 04b0d99 linter: Normalize relative paths with `./` prefix in overrides. (#18954) (connorshea) - 57917ee parser: Parse decorators on rest parameters (#18938) (Boshen) - 07742ea linter/prefer-as-const: Implement fixer for type annotation (#18899) (camc314) - d64bfdd linter/plugins: Ensure `after` hook always runs last in rule converted for ESLint (#18904) (overlookmotel) - ec39944 linter/jsx-a11y/no-distracting-elements: Support elements option (#18892) (camc314) - f609cb6 linter/prefer-expect-type-of: Handle computed elements in fixer correctly (#18890) (camc314) - ecf11e5 linter/dynamic-config: Set `ExternalPlugin.config_dir` to fix js plugins loading (#18854) (camc314) - 01b7838 linter/plugins: Do not destroy workspaces (#18833) (overlookmotel) - dc51d6b linter: Normalize paths slashes for snapshots on windows (#18825) (camc314) - dbfdc40 linter/bad-replace-all-args: Skip extracting flags from conditional expressions (#18844) (camc314) ### ⚡ Performance - ed8c054 oxc_str: Add precomputed hash to Ident for fast HashMap lookups (#19143) (Boshen) - 18f58bd oxlint/lsp: Transform unused disable directive directly to DiagnosticReport (#19112) (Sysix) - 4ce3772 linter: Remove pointless string cloning when combining suggestions (#19075) (overlookmotel) - c417bf5 linter: Avoid allocating `Vec` when compiling `PossibleFixes` (#19074) (overlookmotel) - adb2baa linter/plugins: Avoid allocation when rule provides single suggestion (#19071) (overlookmotel) - 2537924 semantic: Optimize scope resolution with fast paths and inlining (#19029) (Boshen) ### 📚 Documentation - 6e8ef38 linter/plugins: Correct and expand JSDoc comment for `RuleTester` config (#19156) (overlookmotel) - e7ec06a linter: Improve docs for `import/max-dependencies` rule. (#19119) (connorshea) - 367f730 linter/consistent-test-filename: Escape file names fixes #19114 (#19123) (camc314) - 8753a54 linter: Rewrite the docs for the `jsx-a11y/no-redundant-roles` rule. (#19117) (connorshea) - dd44b1a linter: Fix invalid directive in example code for `import/no-nodejs-modules`. (#19115) (connorshea) - 726e273 linter/plugins: Improve JSDoc comment for `DiagnosticReport` (#19103) (overlookmotel) - 9561e7f linter/plugins: Alter JS plugins example (#18900) (overlookmotel) - 501e3b6 linter: Regenerate `config.generated.ts` (#18897) (overlookmotel) - b425a0c linter: Document jsPlugins examples (#18671) (Cameron) - df2b7fa linter: Expand settings example with reference to custom plugins (#18670) (camc314) # Oxfmt ### 💥 BREAKING CHANGES - 856a01f formatter/sort_imports: [**BREAKING**] Replace prefix match with glob pattern in `customGroups.elementNamePattern` (#19066) (leaysgur) ### 🚀 Features - 91e67f3 oxfmt/lsp: Do not refer `.gitignore` (#19206) (leaysgur) - 23c0753 oxfmt: Better Tailwind CSS intergration (#19000) (Dunqing) - 87a920d ci: Add riscv64 and s390x napi targets for oxlint and oxfmt (#19039) (Boshen) - 8536dce oxfmt: Support glob for CLI paths (#18976) (leaysgur) - 6ee2d59 oxfmt: Use `oxc_formatter` in js-in-xxx part (#18373) (leaysgur) - 9788a96 oxlint,oxfmt: Add more native builds (#18853) (Boshen) ### 🐛 Bug Fixes - 119348b oxfmt: Resolve relative -> absolute path for other usages (#19207) (leaysgur) - 5f4cf30 oxfmt: Fix relative -> absolute path resolution with refactoring (#19202) (leaysgur) - dc335d1 oxfmt: Temporarily disable the override for js-in-xxx (not ready yet) (#19043) (leaysgur) - 5ea5bda oxfmt: Handle `isSingleJsxExpressionStatementInMarkdown()` check for js-in-md (#19042) (leaysgur) - 5243307 formatter: Preserve numeric separators in number literals (#19015) (Dunqing) - 9b205b3 formatter: Fallback to formatting when package.json sorting fails (#19097) (Boshen) - b79c065 formatter: Preserve comment between callee and optional chaining operator (#19020) (Dunqing) - 01d1be1 formatter: Remove unnecessary parentheses for single-member union types (#19018) (Dunqing) - f5c7e75 formatter: Preserve parentheses around await with private field access (#19014) (Dunqing) - 5a75785 formatter: Preserve parentheses around nested sequence expressions (#19013) (Dunqing) - f39c96c oxfmt: Do not override `babel-ts` for now (#19030) (leaysgur) - 0ef11bb formatter: Add space before type annotation with leading comment (#19012) (Dunqing) - cc232e1 formatter: Keep spread with callback on same line (#18999) (Dunqing) - ef5bfab oxfmt: Workaround Node.js ThreadsafeFunction cleanup race condition (#18980) (Boshen) - d53f5c4 formatter: Require string first arg in test calls (#18935) (Dunqing) - 57917ee parser: Parse decorators on rest parameters (#18938) (Boshen) - 2db8c05 formatter: Avoid breaking generic call assignments (#18933) (Dunqing) - 1e023e1 formatter: Preserve trailing comma in mts/cts arrow generics (#18928) (Dunqing) - 7c4e558 formatter/detect_code_removal: Do not count `TemplateLiteral` content (#18848) (leaysgur) ### ⚡ Performance - 467724f oxfmt: Collect glob paths in parallel (#19209) (leaysgur) - 61e0efa oxfmt: Use RwLock instead of Mutex for TSFN handles (#18888) (Boshen) Co-authored-by: camc314 <[email protected]>

### 💥 BREAKING CHANGES - 2bf7293 mangler: [**BREAKING**] Enable `top_level` by default for modules and commonjs (oxc-project#18278) (sapphi-red) - 48b0542 span: [**BREAKING**] SourceType::ts should set module to unambigious (oxc-project#18873) (Boshen) ### 🚀 Features - 500d071 minifier: Local traverse ctx and generated minifier traverse (oxc-project#19106) (Boshen) - 142a1be parser: Detect binary files with TS1490 error (oxc-project#19047) (Boshen) - e316857 allocator/bitset: Add `Ones` iterator to `BitSet` (oxc-project#19027) (sapphi-red) - 742ad3f minifier: Default `invalid_import_side_effects` to `false` (oxc-project#18916) (sapphi-red) - 0eff6be parser: Error JSX-like type assertions and generics in `.mts`/`.cts` (oxc-project#18910) (Boshen) - 18320c6 span: Store file extension in `SourceType` (oxc-project#18893) (Boshen) ### 🐛 Bug Fixes - a7514e4 isolated-declarations: Preserve const context in literal type inference (oxc-project#19178) (camc314) - 312e756 isolated-declarations: Preserve readonly literal initializers (oxc-project#19177) (camc314) - d0ca8d0 isolated-declarations: Skip parenthesis when inferring type (oxc-project#19176) (camc314) - 110c300 oxc_ecmascript: `+[false]` and `+[true]` should evaluate to `NaN` (oxc-project#19174) (copilot-swe-agent) - f32ea19 semantic: Report redeclaration error for import bindings conflicting with value declarations (oxc-project#19068) (Boshen) - 3aeba7a semantic: Report redeclaration error for `function a() {} var a` in module mode (oxc-project#19041) (Boshen) - 35e32c6 coverage: Match Babel's options.json inheritance for test fixtures (oxc-project#19002) (Boshen) - 463d60d semantic: Skip TS2391 for standalone computed-name class methods (oxc-project#19025) (Boshen) - 56c086b parser: Add modifier ordering validation (TS1029) (oxc-project#19024) (Boshen) - 6067a49 linter/jsdoc: False positive in `check-tag-names` for `@` in email addresses and npm scopes (oxc-project#19021) (Boshen) - b13bb70 semantic/jsdoc: Inline tags like `{@link}` break jsdoc parsing (oxc-project#19019) (Boshen) - e3609e3 regular_expression: Preserve UnicodeEscape CharacterKind in string literals (oxc-project#18998) (Boshen) - 57917ee parser: Parse decorators on rest parameters (oxc-project#18938) (Boshen) - 487601b napi: Disable mimalloc on Windows to fix worker_threads crash (oxc-project#18923) (Boshen) - 1f6b193 parser: Validate TypeScript import type options (oxc-project#18889) (Boshen) - 1663184 parser: Allow conditional types in function type parameters (oxc-project#18886) (Boshen) - 5758046 parser: Error on property access after instantiation expression (oxc-project#18887) (Boshen) - 5eb4a94 parser: Handle `<<` as two `<` tokens in type argument contexts (oxc-project#18885) (Boshen) ### ⚡ Performance - ed8c054 oxc_str: Add precomputed hash to Ident for fast HashMap lookups (oxc-project#19143) (Boshen) - d4a0867 transformer_plugins: Switch ReplaceGlobalDefines from Traverse to VisitMut (oxc-project#19146) (Boshen) - 9eb16b3 syntax: Pack ASCII identifier tables into single bitflag table (oxc-project#19088) (Boshen) - e7595d1 mangler: Use BitSet for exported symbols set (oxc-project#19023) (sapphi-red) - 2537924 semantic: Optimize scope resolution with fast paths and inlining (oxc-project#19029) (Boshen) - 69a8d85 mangler: Use BitSet for keep_names symbols set (oxc-project#19028) (sapphi-red) - f78c525 parser: Try hybrid parsing for jsx children and closing element/fragments (oxc-project#18789) (camchenry) Co-authored-by: camc314 <[email protected]>

# Oxlint ### 🚀 Features - aef2af5 linter/unicorn: Add fixer for `unicorn/relative-url-style` rule (oxc-project#19186) (Mikhail Baev) - 80eba6f linter/max-params: Support `countThis` option (oxc-project#19175) (camc314) - e19bc45 linter/no-new-func: Improve rule diagnostic with note and actionable help message (oxc-project#19132) (Sean Gallen) - e3dc5f6 linter/plugins: `RuleTester` test suggestions (oxc-project#19104) (overlookmotel) - 6054249 linter/plugins: Add `recursive` option to `RuleTester` (oxc-project#19093) (overlookmotel) - 27c241b linter/plugins: `RuleTester` test fixes (oxc-project#19091) (overlookmotel) - 7318275 linter/new-cap: Tighten diagnostic spans and add help text (oxc-project#19131) (camchenry) - ac2b16b linter: Improve `no-misleading-character-class` diagnostic spans (oxc-project#19109) (Sysix) - 7be8613 linter: Move `no-misleading-chracter-class` to `correctness` (oxc-project#19006) (Sysix) - 87a920d ci: Add riscv64 and s390x napi targets for oxlint and oxfmt (oxc-project#19039) (Boshen) - ee2925b oxlint/lsp: Enable JS plugins (oxc-project#18834) (overlookmotel) - 533013d linter/unicorn: Implement suggestion for `unicorn/prefer-dom-node-dataset` (oxc-project#19051) (Mikhail Baev) - 384abae linter/oxc/no-async-endpoint-handlers: Improve diagnostic message (oxc-project#19001) (camc314) - d35ece3 linter/array-callback-return: Improve diagnostic hints for some cases (oxc-project#18993) (camc314) - dd0f754 linter/array-callback-return: Improve diagnostic message for `forEach` case (oxc-project#18992) (camc314) - e2d28fe linter/plugins: Implement suggestions (oxc-project#18963) (overlookmotel) - a398152 linter: Promote the `eslint/no-iterator` rule to correctness, which makes it a default rule (oxc-project#18915) (connorshea) - bb1eb97 linter: Improve diagnostic message for circular configs (oxc-project#18947) (camc314) - 3184f36 linter: Ban relative js plugin specifiers in js extends config (oxc-project#18944) (camc314) - 749972f linter: Validate dynamic config extends shape (oxc-project#18943) (camc314) - b270739 linter: Support extends in oxlint.config.ts (oxc-project#18942) (camc314) - 6024ddf linter: Implement suggestion for `unicorn/prefer-reflect-apply` (oxc-project#18932) (Mikhail Baev) - b06b3a9 linter: Implement `typescript/consistent-type-assertions` (oxc-project#18869) (Bazyli Brzóska) - 9fd3bd6 linter/plugins: Add `@oxlint/plugins` NPM package (oxc-project#18824) (overlookmotel) - 5ee7b2f linter/vitest: Implements `prefer-expect-type-of` rule (oxc-project#17957) (Said Atrahouch) - a7b360a linter/unicorn: Implement `unicorn/relative-url-style` rule (oxc-project#18857) (Mikhail Baev) - 9788a96 oxlint,oxfmt: Add more native builds (oxc-project#18853) (Boshen) - b23395a linter: Enforce exporting an object with `defineConfig` (oxc-project#18858) (camc314) ### 🐛 Bug Fixes - 7800fc5 linter/prefer-event-target: Ignore EventEmitter imported from packages (oxc-project#19188) (camc314) - 03b2955 linter/typescript/ban-types: Mark rule as deprecated (oxc-project#19179) (camc314) - a5b8766 oxlint/lsp: Disable rule for this line should not be preferred (oxc-project#19083) (Sysix) - e08157e linter/jsx-filename-extension: Include filename in as-needed diagnostic (oxc-project#19172) (camc314) - 1773acb oxlint: Re-generate envs (oxc-project#19169) (camc314) - 51c3fc8 linter/no-array-for-each: Skip `Effect.forEach` calls (oxc-project#19127) (camc314) - 825f148 linter/plugins: `RuleTester` consider adjacent fixes as overlapping in ESLint compat mode (oxc-project#19094) (overlookmotel) - ecd2456 linter/plugins: Handle fix with -1 offsets in file with BOM (oxc-project#19092) (overlookmotel) - 5969d26 linter/no-array-sort: Avoid false positives for effect Chunk.sort (oxc-project#19125) (camc314) - de10f04 linter: `no-misleading-character-class`: do not skip reporting on first invalid sequence of the checking group (oxc-project#19111) (Sysix) - 8c0ce78 linter: Scope no-misleading-character-class sequences to single character class (oxc-project#19108) (copilot-swe-agent) - 879e3a0 linter: `no-misleading-character-class`: split sequences on all `CharacterSet` (oxc-project#19107) (Sysix) - 2ad33cc oxlint/lsp: Search parent directories for root oxlint config (oxc-project#19062) (copilot-swe-agent) - f969d5e linter/prefer-dom-node-dataset: Address some edge cases in the fixer (oxc-project#19065) (camc314) - ed759d1 linter/plugins: Fix error messages for invalid suggestions (oxc-project#19059) (overlookmotel) - 34851a7 linter/plugins: Error not panic if invalid fix range (oxc-project#19058) (overlookmotel) - 4823b58 linter/plugins: Fix fixes in files with BOM (oxc-project#19056) (overlookmotel) - 2ef405e linter/no-map-spread: Improve actionability of error message (oxc-project#19007) (Artyom Alekseevich) - 56c086b parser: Add modifier ordering validation (TS1029) (oxc-project#19024) (Boshen) - 6067a49 linter/jsdoc: False positive in `check-tag-names` for `@` in email addresses and npm scopes (oxc-project#19021) (Boshen) - 6d46ed9 linter/capitalized-comments: Ignore prettier and oxfmt directives (oxc-project#19008) (Artyom Alekseevich) - a46c878 linter/react/no-array-index-key: Look for keys in expressions (oxc-project#18997) (camc314) - 7d61704 linter/prefer-at: Skip autofix for `arguments` (oxc-project#18991) (camc314) - 3ebae53 linter/preserve-caught-error: Skip traversing into nested try/catch stmts (oxc-project#18990) (camc314) - e94d37e linter/react/no-unknown-property: Add missing `popover` related props (oxc-project#18953) (Christoph Nakazawa) - 04b0d99 linter: Normalize relative paths with `./` prefix in overrides. (oxc-project#18954) (connorshea) - 57917ee parser: Parse decorators on rest parameters (oxc-project#18938) (Boshen) - 07742ea linter/prefer-as-const: Implement fixer for type annotation (oxc-project#18899) (camc314) - d64bfdd linter/plugins: Ensure `after` hook always runs last in rule converted for ESLint (oxc-project#18904) (overlookmotel) - ec39944 linter/jsx-a11y/no-distracting-elements: Support elements option (oxc-project#18892) (camc314) - f609cb6 linter/prefer-expect-type-of: Handle computed elements in fixer correctly (oxc-project#18890) (camc314) - ecf11e5 linter/dynamic-config: Set `ExternalPlugin.config_dir` to fix js plugins loading (oxc-project#18854) (camc314) - 01b7838 linter/plugins: Do not destroy workspaces (oxc-project#18833) (overlookmotel) - dc51d6b linter: Normalize paths slashes for snapshots on windows (oxc-project#18825) (camc314) - dbfdc40 linter/bad-replace-all-args: Skip extracting flags from conditional expressions (oxc-project#18844) (camc314) ### ⚡ Performance - ed8c054 oxc_str: Add precomputed hash to Ident for fast HashMap lookups (oxc-project#19143) (Boshen) - 18f58bd oxlint/lsp: Transform unused disable directive directly to DiagnosticReport (oxc-project#19112) (Sysix) - 4ce3772 linter: Remove pointless string cloning when combining suggestions (oxc-project#19075) (overlookmotel) - c417bf5 linter: Avoid allocating `Vec` when compiling `PossibleFixes` (oxc-project#19074) (overlookmotel) - adb2baa linter/plugins: Avoid allocation when rule provides single suggestion (oxc-project#19071) (overlookmotel) - 2537924 semantic: Optimize scope resolution with fast paths and inlining (oxc-project#19029) (Boshen) ### 📚 Documentation - 6e8ef38 linter/plugins: Correct and expand JSDoc comment for `RuleTester` config (oxc-project#19156) (overlookmotel) - e7ec06a linter: Improve docs for `import/max-dependencies` rule. (oxc-project#19119) (connorshea) - 367f730 linter/consistent-test-filename: Escape file names fixes oxc-project#19114 (oxc-project#19123) (camc314) - 8753a54 linter: Rewrite the docs for the `jsx-a11y/no-redundant-roles` rule. (oxc-project#19117) (connorshea) - dd44b1a linter: Fix invalid directive in example code for `import/no-nodejs-modules`. (oxc-project#19115) (connorshea) - 726e273 linter/plugins: Improve JSDoc comment for `DiagnosticReport` (oxc-project#19103) (overlookmotel) - 9561e7f linter/plugins: Alter JS plugins example (oxc-project#18900) (overlookmotel) - 501e3b6 linter: Regenerate `config.generated.ts` (oxc-project#18897) (overlookmotel) - b425a0c linter: Document jsPlugins examples (oxc-project#18671) (Cameron) - df2b7fa linter: Expand settings example with reference to custom plugins (oxc-project#18670) (camc314) # Oxfmt ### 💥 BREAKING CHANGES - 856a01f formatter/sort_imports: [**BREAKING**] Replace prefix match with glob pattern in `customGroups.elementNamePattern` (oxc-project#19066) (leaysgur) ### 🚀 Features - 91e67f3 oxfmt/lsp: Do not refer `.gitignore` (oxc-project#19206) (leaysgur) - 23c0753 oxfmt: Better Tailwind CSS intergration (oxc-project#19000) (Dunqing) - 87a920d ci: Add riscv64 and s390x napi targets for oxlint and oxfmt (oxc-project#19039) (Boshen) - 8536dce oxfmt: Support glob for CLI paths (oxc-project#18976) (leaysgur) - 6ee2d59 oxfmt: Use `oxc_formatter` in js-in-xxx part (oxc-project#18373) (leaysgur) - 9788a96 oxlint,oxfmt: Add more native builds (oxc-project#18853) (Boshen) ### 🐛 Bug Fixes - 119348b oxfmt: Resolve relative -> absolute path for other usages (oxc-project#19207) (leaysgur) - 5f4cf30 oxfmt: Fix relative -> absolute path resolution with refactoring (oxc-project#19202) (leaysgur) - dc335d1 oxfmt: Temporarily disable the override for js-in-xxx (not ready yet) (oxc-project#19043) (leaysgur) - 5ea5bda oxfmt: Handle `isSingleJsxExpressionStatementInMarkdown()` check for js-in-md (oxc-project#19042) (leaysgur) - 5243307 formatter: Preserve numeric separators in number literals (oxc-project#19015) (Dunqing) - 9b205b3 formatter: Fallback to formatting when package.json sorting fails (oxc-project#19097) (Boshen) - b79c065 formatter: Preserve comment between callee and optional chaining operator (oxc-project#19020) (Dunqing) - 01d1be1 formatter: Remove unnecessary parentheses for single-member union types (oxc-project#19018) (Dunqing) - f5c7e75 formatter: Preserve parentheses around await with private field access (oxc-project#19014) (Dunqing) - 5a75785 formatter: Preserve parentheses around nested sequence expressions (oxc-project#19013) (Dunqing) - f39c96c oxfmt: Do not override `babel-ts` for now (oxc-project#19030) (leaysgur) - 0ef11bb formatter: Add space before type annotation with leading comment (oxc-project#19012) (Dunqing) - cc232e1 formatter: Keep spread with callback on same line (oxc-project#18999) (Dunqing) - ef5bfab oxfmt: Workaround Node.js ThreadsafeFunction cleanup race condition (oxc-project#18980) (Boshen) - d53f5c4 formatter: Require string first arg in test calls (oxc-project#18935) (Dunqing) - 57917ee parser: Parse decorators on rest parameters (oxc-project#18938) (Boshen) - 2db8c05 formatter: Avoid breaking generic call assignments (oxc-project#18933) (Dunqing) - 1e023e1 formatter: Preserve trailing comma in mts/cts arrow generics (oxc-project#18928) (Dunqing) - 7c4e558 formatter/detect_code_removal: Do not count `TemplateLiteral` content (oxc-project#18848) (leaysgur) ### ⚡ Performance - 467724f oxfmt: Collect glob paths in parallel (oxc-project#19209) (leaysgur) - 61e0efa oxfmt: Use RwLock instead of Mutex for TSFN handles (oxc-project#18888) (Boshen) Co-authored-by: camc314 <[email protected]>

oxc-project#19029) ## Summary - Add early return when current scope has no unresolved references - Skip resolution entirely for scopes with no bindings (if-blocks, try-blocks, loop bodies without `let`) — merge unresolved refs to parent using O(1) swap when possible - Use union-by-size merge (drain smaller map into larger) for non-empty parents - Add `#[inline]` to hot per-reference functions: `declare_reference`, `reference_identifier`, `create_reference` ### Benchmark results (semantic) ``` group main pr ----- ---- -- semantic/RadixUIAdoptionSection.jsx 1.05 4.1±0.05µs ? ?/sec 1.00 3.9±0.03µs ? ?/sec semantic/binder.ts 1.03 469.3±26.69µs ? ?/sec 1.00 456.3±17.59µs ? ?/sec semantic/cal.com.tsx 1.00 3.6±0.03ms ? ?/sec 1.01 3.6±0.04ms ? ?/sec semantic/react.development.js 1.01 171.9±3.86µs ? ?/sec 1.00 170.0±9.19µs ? ?/sec ``` ### Benchmark results (pipeline) ``` group main pr ----- ---- -- pipeline/RadixUIAdoptionSection.jsx 1.03 29.8±0.35µs ? ?/sec 1.00 29.0±0.25µs ? ?/sec pipeline/binder.ts 1.00 2.9±0.07ms ? ?/sec 1.00 2.9±0.09ms ? ?/sec pipeline/cal.com.tsx 1.00 25.0±0.32ms ? ?/sec 1.01 25.2±0.36ms ? ?/sec pipeline/react.development.js 1.03 1317.1±96.08µs ? ?/sec 1.00 1273.5±18.26µs ? ?/sec ``` ### Analysis Scope resolution (`resolve_references_for_current_scope`) is called on every scope exit. Many scopes (if-blocks, try-blocks, loop bodies) have zero bindings, yet the current code still drains all unresolved references one-by-one through hash maps. The swap optimization makes this O(1) for the common case where the parent has no accumulated refs yet (first/only child scope). The `#[inline]` additions target functions called per-identifier-reference (~hundreds to thousands of times per file) that were not previously inlined. Note: 3 linter snapshot ordering changes expected (diagnostics emitted in different order due to hash map iteration order change from swap). 🤖 Generated with [Claude Code](https://claude.com/claude-code)

### 💥 BREAKING CHANGES - 2bf7293 mangler: [**BREAKING**] Enable `top_level` by default for modules and commonjs (oxc-project#18278) (sapphi-red) - 48b0542 span: [**BREAKING**] SourceType::ts should set module to unambigious (oxc-project#18873) (Boshen) ### 🚀 Features - 500d071 minifier: Local traverse ctx and generated minifier traverse (oxc-project#19106) (Boshen) - 142a1be parser: Detect binary files with TS1490 error (oxc-project#19047) (Boshen) - e316857 allocator/bitset: Add `Ones` iterator to `BitSet` (oxc-project#19027) (sapphi-red) - 742ad3f minifier: Default `invalid_import_side_effects` to `false` (oxc-project#18916) (sapphi-red) - 0eff6be parser: Error JSX-like type assertions and generics in `.mts`/`.cts` (oxc-project#18910) (Boshen) - 18320c6 span: Store file extension in `SourceType` (oxc-project#18893) (Boshen) ### 🐛 Bug Fixes - a7514e4 isolated-declarations: Preserve const context in literal type inference (oxc-project#19178) (camc314) - 312e756 isolated-declarations: Preserve readonly literal initializers (oxc-project#19177) (camc314) - d0ca8d0 isolated-declarations: Skip parenthesis when inferring type (oxc-project#19176) (camc314) - 110c300 oxc_ecmascript: `+[false]` and `+[true]` should evaluate to `NaN` (oxc-project#19174) (copilot-swe-agent) - f32ea19 semantic: Report redeclaration error for import bindings conflicting with value declarations (oxc-project#19068) (Boshen) - 3aeba7a semantic: Report redeclaration error for `function a() {} var a` in module mode (oxc-project#19041) (Boshen) - 35e32c6 coverage: Match Babel's options.json inheritance for test fixtures (oxc-project#19002) (Boshen) - 463d60d semantic: Skip TS2391 for standalone computed-name class methods (oxc-project#19025) (Boshen) - 56c086b parser: Add modifier ordering validation (TS1029) (oxc-project#19024) (Boshen) - 6067a49 linter/jsdoc: False positive in `check-tag-names` for `@` in email addresses and npm scopes (oxc-project#19021) (Boshen) - b13bb70 semantic/jsdoc: Inline tags like `{@link}` break jsdoc parsing (oxc-project#19019) (Boshen) - e3609e3 regular_expression: Preserve UnicodeEscape CharacterKind in string literals (oxc-project#18998) (Boshen) - 57917ee parser: Parse decorators on rest parameters (oxc-project#18938) (Boshen) - 487601b napi: Disable mimalloc on Windows to fix worker_threads crash (oxc-project#18923) (Boshen) - 1f6b193 parser: Validate TypeScript import type options (oxc-project#18889) (Boshen) - 1663184 parser: Allow conditional types in function type parameters (oxc-project#18886) (Boshen) - 5758046 parser: Error on property access after instantiation expression (oxc-project#18887) (Boshen) - 5eb4a94 parser: Handle `<<` as two `<` tokens in type argument contexts (oxc-project#18885) (Boshen) ### ⚡ Performance - ed8c054 oxc_str: Add precomputed hash to Ident for fast HashMap lookups (oxc-project#19143) (Boshen) - d4a0867 transformer_plugins: Switch ReplaceGlobalDefines from Traverse to VisitMut (oxc-project#19146) (Boshen) - 9eb16b3 syntax: Pack ASCII identifier tables into single bitflag table (oxc-project#19088) (Boshen) - e7595d1 mangler: Use BitSet for exported symbols set (oxc-project#19023) (sapphi-red) - 2537924 semantic: Optimize scope resolution with fast paths and inlining (oxc-project#19029) (Boshen) - 69a8d85 mangler: Use BitSet for keep_names symbols set (oxc-project#19028) (sapphi-red) - f78c525 parser: Try hybrid parsing for jsx children and closing element/fragments (oxc-project#18789) (camchenry) Co-authored-by: camc314 <[email protected]>

# Oxlint ### 🚀 Features - aef2af5 linter/unicorn: Add fixer for `unicorn/relative-url-style` rule (oxc-project#19186) (Mikhail Baev) - 80eba6f linter/max-params: Support `countThis` option (oxc-project#19175) (camc314) - e19bc45 linter/no-new-func: Improve rule diagnostic with note and actionable help message (oxc-project#19132) (Sean Gallen) - e3dc5f6 linter/plugins: `RuleTester` test suggestions (oxc-project#19104) (overlookmotel) - 6054249 linter/plugins: Add `recursive` option to `RuleTester` (oxc-project#19093) (overlookmotel) - 27c241b linter/plugins: `RuleTester` test fixes (oxc-project#19091) (overlookmotel) - 7318275 linter/new-cap: Tighten diagnostic spans and add help text (oxc-project#19131) (camchenry) - ac2b16b linter: Improve `no-misleading-character-class` diagnostic spans (oxc-project#19109) (Sysix) - 7be8613 linter: Move `no-misleading-chracter-class` to `correctness` (oxc-project#19006) (Sysix) - 87a920d ci: Add riscv64 and s390x napi targets for oxlint and oxfmt (oxc-project#19039) (Boshen) - ee2925b oxlint/lsp: Enable JS plugins (oxc-project#18834) (overlookmotel) - 533013d linter/unicorn: Implement suggestion for `unicorn/prefer-dom-node-dataset` (oxc-project#19051) (Mikhail Baev) - 384abae linter/oxc/no-async-endpoint-handlers: Improve diagnostic message (oxc-project#19001) (camc314) - d35ece3 linter/array-callback-return: Improve diagnostic hints for some cases (oxc-project#18993) (camc314) - dd0f754 linter/array-callback-return: Improve diagnostic message for `forEach` case (oxc-project#18992) (camc314) - e2d28fe linter/plugins: Implement suggestions (oxc-project#18963) (overlookmotel) - a398152 linter: Promote the `eslint/no-iterator` rule to correctness, which makes it a default rule (oxc-project#18915) (connorshea) - bb1eb97 linter: Improve diagnostic message for circular configs (oxc-project#18947) (camc314) - 3184f36 linter: Ban relative js plugin specifiers in js extends config (oxc-project#18944) (camc314) - 749972f linter: Validate dynamic config extends shape (oxc-project#18943) (camc314) - b270739 linter: Support extends in oxlint.config.ts (oxc-project#18942) (camc314) - 6024ddf linter: Implement suggestion for `unicorn/prefer-reflect-apply` (oxc-project#18932) (Mikhail Baev) - b06b3a9 linter: Implement `typescript/consistent-type-assertions` (oxc-project#18869) (Bazyli Brzóska) - 9fd3bd6 linter/plugins: Add `@oxlint/plugins` NPM package (oxc-project#18824) (overlookmotel) - 5ee7b2f linter/vitest: Implements `prefer-expect-type-of` rule (oxc-project#17957) (Said Atrahouch) - a7b360a linter/unicorn: Implement `unicorn/relative-url-style` rule (oxc-project#18857) (Mikhail Baev) - 9788a96 oxlint,oxfmt: Add more native builds (oxc-project#18853) (Boshen) - b23395a linter: Enforce exporting an object with `defineConfig` (oxc-project#18858) (camc314) ### 🐛 Bug Fixes - 7800fc5 linter/prefer-event-target: Ignore EventEmitter imported from packages (oxc-project#19188) (camc314) - 03b2955 linter/typescript/ban-types: Mark rule as deprecated (oxc-project#19179) (camc314) - a5b8766 oxlint/lsp: Disable rule for this line should not be preferred (oxc-project#19083) (Sysix) - e08157e linter/jsx-filename-extension: Include filename in as-needed diagnostic (oxc-project#19172) (camc314) - 1773acb oxlint: Re-generate envs (oxc-project#19169) (camc314) - 51c3fc8 linter/no-array-for-each: Skip `Effect.forEach` calls (oxc-project#19127) (camc314) - 825f148 linter/plugins: `RuleTester` consider adjacent fixes as overlapping in ESLint compat mode (oxc-project#19094) (overlookmotel) - ecd2456 linter/plugins: Handle fix with -1 offsets in file with BOM (oxc-project#19092) (overlookmotel) - 5969d26 linter/no-array-sort: Avoid false positives for effect Chunk.sort (oxc-project#19125) (camc314) - de10f04 linter: `no-misleading-character-class`: do not skip reporting on first invalid sequence of the checking group (oxc-project#19111) (Sysix) - 8c0ce78 linter: Scope no-misleading-character-class sequences to single character class (oxc-project#19108) (copilot-swe-agent) - 879e3a0 linter: `no-misleading-character-class`: split sequences on all `CharacterSet` (oxc-project#19107) (Sysix) - 2ad33cc oxlint/lsp: Search parent directories for root oxlint config (oxc-project#19062) (copilot-swe-agent) - f969d5e linter/prefer-dom-node-dataset: Address some edge cases in the fixer (oxc-project#19065) (camc314) - ed759d1 linter/plugins: Fix error messages for invalid suggestions (oxc-project#19059) (overlookmotel) - 34851a7 linter/plugins: Error not panic if invalid fix range (oxc-project#19058) (overlookmotel) - 4823b58 linter/plugins: Fix fixes in files with BOM (oxc-project#19056) (overlookmotel) - 2ef405e linter/no-map-spread: Improve actionability of error message (oxc-project#19007) (Artyom Alekseevich) - 56c086b parser: Add modifier ordering validation (TS1029) (oxc-project#19024) (Boshen) - 6067a49 linter/jsdoc: False positive in `check-tag-names` for `@` in email addresses and npm scopes (oxc-project#19021) (Boshen) - 6d46ed9 linter/capitalized-comments: Ignore prettier and oxfmt directives (oxc-project#19008) (Artyom Alekseevich) - a46c878 linter/react/no-array-index-key: Look for keys in expressions (oxc-project#18997) (camc314) - 7d61704 linter/prefer-at: Skip autofix for `arguments` (oxc-project#18991) (camc314) - 3ebae53 linter/preserve-caught-error: Skip traversing into nested try/catch stmts (oxc-project#18990) (camc314) - e94d37e linter/react/no-unknown-property: Add missing `popover` related props (oxc-project#18953) (Christoph Nakazawa) - 04b0d99 linter: Normalize relative paths with `./` prefix in overrides. (oxc-project#18954) (connorshea) - 57917ee parser: Parse decorators on rest parameters (oxc-project#18938) (Boshen) - 07742ea linter/prefer-as-const: Implement fixer for type annotation (oxc-project#18899) (camc314) - d64bfdd linter/plugins: Ensure `after` hook always runs last in rule converted for ESLint (oxc-project#18904) (overlookmotel) - ec39944 linter/jsx-a11y/no-distracting-elements: Support elements option (oxc-project#18892) (camc314) - f609cb6 linter/prefer-expect-type-of: Handle computed elements in fixer correctly (oxc-project#18890) (camc314) - ecf11e5 linter/dynamic-config: Set `ExternalPlugin.config_dir` to fix js plugins loading (oxc-project#18854) (camc314) - 01b7838 linter/plugins: Do not destroy workspaces (oxc-project#18833) (overlookmotel) - dc51d6b linter: Normalize paths slashes for snapshots on windows (oxc-project#18825) (camc314) - dbfdc40 linter/bad-replace-all-args: Skip extracting flags from conditional expressions (oxc-project#18844) (camc314) ### ⚡ Performance - ed8c054 oxc_str: Add precomputed hash to Ident for fast HashMap lookups (oxc-project#19143) (Boshen) - 18f58bd oxlint/lsp: Transform unused disable directive directly to DiagnosticReport (oxc-project#19112) (Sysix) - 4ce3772 linter: Remove pointless string cloning when combining suggestions (oxc-project#19075) (overlookmotel) - c417bf5 linter: Avoid allocating `Vec` when compiling `PossibleFixes` (oxc-project#19074) (overlookmotel) - adb2baa linter/plugins: Avoid allocation when rule provides single suggestion (oxc-project#19071) (overlookmotel) - 2537924 semantic: Optimize scope resolution with fast paths and inlining (oxc-project#19029) (Boshen) ### 📚 Documentation - 6e8ef38 linter/plugins: Correct and expand JSDoc comment for `RuleTester` config (oxc-project#19156) (overlookmotel) - e7ec06a linter: Improve docs for `import/max-dependencies` rule. (oxc-project#19119) (connorshea) - 367f730 linter/consistent-test-filename: Escape file names fixes oxc-project#19114 (oxc-project#19123) (camc314) - 8753a54 linter: Rewrite the docs for the `jsx-a11y/no-redundant-roles` rule. (oxc-project#19117) (connorshea) - dd44b1a linter: Fix invalid directive in example code for `import/no-nodejs-modules`. (oxc-project#19115) (connorshea) - 726e273 linter/plugins: Improve JSDoc comment for `DiagnosticReport` (oxc-project#19103) (overlookmotel) - 9561e7f linter/plugins: Alter JS plugins example (oxc-project#18900) (overlookmotel) - 501e3b6 linter: Regenerate `config.generated.ts` (oxc-project#18897) (overlookmotel) - b425a0c linter: Document jsPlugins examples (oxc-project#18671) (Cameron) - df2b7fa linter: Expand settings example with reference to custom plugins (oxc-project#18670) (camc314) # Oxfmt ### 💥 BREAKING CHANGES - 856a01f formatter/sort_imports: [**BREAKING**] Replace prefix match with glob pattern in `customGroups.elementNamePattern` (oxc-project#19066) (leaysgur) ### 🚀 Features - 91e67f3 oxfmt/lsp: Do not refer `.gitignore` (oxc-project#19206) (leaysgur) - 23c0753 oxfmt: Better Tailwind CSS intergration (oxc-project#19000) (Dunqing) - 87a920d ci: Add riscv64 and s390x napi targets for oxlint and oxfmt (oxc-project#19039) (Boshen) - 8536dce oxfmt: Support glob for CLI paths (oxc-project#18976) (leaysgur) - 6ee2d59 oxfmt: Use `oxc_formatter` in js-in-xxx part (oxc-project#18373) (leaysgur) - 9788a96 oxlint,oxfmt: Add more native builds (oxc-project#18853) (Boshen) ### 🐛 Bug Fixes - 119348b oxfmt: Resolve relative -> absolute path for other usages (oxc-project#19207) (leaysgur) - 5f4cf30 oxfmt: Fix relative -> absolute path resolution with refactoring (oxc-project#19202) (leaysgur) - dc335d1 oxfmt: Temporarily disable the override for js-in-xxx (not ready yet) (oxc-project#19043) (leaysgur) - 5ea5bda oxfmt: Handle `isSingleJsxExpressionStatementInMarkdown()` check for js-in-md (oxc-project#19042) (leaysgur) - 5243307 formatter: Preserve numeric separators in number literals (oxc-project#19015) (Dunqing) - 9b205b3 formatter: Fallback to formatting when package.json sorting fails (oxc-project#19097) (Boshen) - b79c065 formatter: Preserve comment between callee and optional chaining operator (oxc-project#19020) (Dunqing) - 01d1be1 formatter: Remove unnecessary parentheses for single-member union types (oxc-project#19018) (Dunqing) - f5c7e75 formatter: Preserve parentheses around await with private field access (oxc-project#19014) (Dunqing) - 5a75785 formatter: Preserve parentheses around nested sequence expressions (oxc-project#19013) (Dunqing) - f39c96c oxfmt: Do not override `babel-ts` for now (oxc-project#19030) (leaysgur) - 0ef11bb formatter: Add space before type annotation with leading comment (oxc-project#19012) (Dunqing) - cc232e1 formatter: Keep spread with callback on same line (oxc-project#18999) (Dunqing) - ef5bfab oxfmt: Workaround Node.js ThreadsafeFunction cleanup race condition (oxc-project#18980) (Boshen) - d53f5c4 formatter: Require string first arg in test calls (oxc-project#18935) (Dunqing) - 57917ee parser: Parse decorators on rest parameters (oxc-project#18938) (Boshen) - 2db8c05 formatter: Avoid breaking generic call assignments (oxc-project#18933) (Dunqing) - 1e023e1 formatter: Preserve trailing comma in mts/cts arrow generics (oxc-project#18928) (Dunqing) - 7c4e558 formatter/detect_code_removal: Do not count `TemplateLiteral` content (oxc-project#18848) (leaysgur) ### ⚡ Performance - 467724f oxfmt: Collect glob paths in parallel (oxc-project#19209) (leaysgur) - 61e0efa oxfmt: Use RwLock instead of Mutex for TSFN handles (oxc-project#18888) (Boshen) Co-authored-by: camc314 <[email protected]>

github-actions bot added A-semantic Area - Semantic C-performance Category - Solution not expected to change functional behavior, only performance labels Feb 6, 2026

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Boshen marked this pull request as ready for review February 6, 2026 07:15

Boshen requested review from Dunqing and camc314 as code owners February 6, 2026 07:15

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This was referenced Feb 9, 2026

release(crates): oxc v0.113.0 #19167

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release(crates): oxc v0.113.0 #19215

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perf(semantic): optimize scope resolution with fast paths and inlining#19029

perf(semantic): optimize scope resolution with fast paths and inlining#19029
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perf/scope-resolution-fast-path

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Boshen commented Feb 6, 2026

Summary

Benchmark results (semantic)

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Merging this PR will improve performance by 4.19%

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